Twoway signal output: provides both level (digital) output and analog output for flexible integration into control or monitoring systems. Asignal (analog) output supported; output instructions are provided for correct wiring and interpretation. sensitivity and good selectivity to carbon dioxide, enabling reliable detection of CO2 changes. Effective handling of lowlevel signals: the lowlevel output signal can be read directly by a singlechip microcomputer (microcontroller) when the output is in its normal low state. Easy integration: use the level output for simple alarm or threshold detection and the analog output for precise measurement and data logging. Compatibility: suitable for direct connection to microcontrollers, PLCs, ADCequipped data loggers, and other common control electronics (refer to the product's electrical specifications for voltage and timing details). Performance: optimized for fast, sensitive CO2 response while minimizing crosssensitivity to other gases. Typical applications Indoor air quality and ventilation control: trigger fans, dampers, or HVAC adjustments using the level output and record CO2 concentration trends via the analog output. Classrooms, offices, and meeting rooms: monitor CO2 to maintain healthy occupant levels and log data for building management systems. Greenhouses or controlledenvironment agriculture: integrate with controllers to manage ventilation and CO2 enrichment systems. Notes and installation tips Follow the provided output instructions for correct wiring of the Asignal (analog) and level outputs. When connecting to a singlechip microcomputer, verify input voltage thresholds and use the level output directly when compatible. Consult the detailed product specifications for exact dimensions, materials, electrical characteristics, and recommended operating conditions.